This dataset is part of the 3D hydrostratigraphic model of the Calgary-Lethbridge Corridor (CLC), southwestern Alberta. It represents the structure top of hydrostratigraphic unit (HSU) S1, which contains coarse-grained fluvial materialsl lying directly on bedrock and constrained to paleovalleys and some upland surfaces in the Neogene-Quaternary succession of the CLC.

This dataset supplements Alberta Geological Survey (AGS) Report 91, which includes a full description of steps taken to produce the structure grid.